The Paperwhite has a 6" screen. If that is to small, you can get an Oasis with a 7" screen. That will allow you to stay in the same environment as your wife.
Otherwise, Kobo have the Libra H2O which is 7", and pretty much a direct competitor for the Oasis, though less expensive. They also have the Forma which has an 8" screen, but it is also fairly expensive. These are excellent devices.
Tolino is another brand, but, not easily available in the USA. They share hardware with Kobo, but, use different software.
There are other brands, but, my knowledge of them is minimal. I'm sure someone will be along in a few minutes with details.
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